Frequencies for first 10,000 rows of electrol variable in nhamcsed2009 dataset :

electrolyte |
          s |      Freq.     Percent        Cum.
------------+-----------------------------------
          0 |      8,000       80.00       80.00
          1 |      2,000       20.00      100.00
------------+-----------------------------------
      Total |     10,000      100.00

by Jean Roth , jroth@nber.org , 28 Mar 2016